Malicious PDF — malware analysis report

Static analysis result for SHA-256 265c60c2f8917bee…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 17:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52f70bff17cc1df6816aa9c62389899e SHA-1: 0e23afcd297db4998c9f0646217f28ebbf30f9e1 SHA-256: 265c60c2f8917beed5d5722b406019f4f24b097e680311a119211f1db01d309f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of these links and the overall detection indicate an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://electrodomesticaruano.com/images/ckfinder/files/kukado.pdf In PDF document text
    • http://www.tamtrebinhminh.com/public/files/41615550034.pdfIn PDF document text
    • https://proia.bg/userfiles/file/balawaxufolujifozosubap.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009b51d2c2---vetaxenomobawaxubosifolow.pdfIn PDF document text
    • https://xigmatek.com/upload/files/zalegu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e143aeb625---43303139298.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762ff877ab1---jatinewap.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115eecad1---8406716189.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/20988628389.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607356e000601---31939720735.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/gitowegotirusavolu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/36355803316.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99478d33e0---86995152602.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf08125c01---wosuvamikenojuselo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8f4d031b094a9097f6f393abb94b4abe/76224146106.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pumitigazususojojevawe.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b574e6238c6---92843256735.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dirikuxipir.pdfIn PDF document text
    • https://esvigo.com/upload/files/41269111467.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e11cac3a79---48980857116.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/xovenumajozupunevab.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/juzexumax.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/64124789282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hp+envy+7640+setup+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E9 16244 bytes
SHA-256: 53257121830071d05ac35275e9eca15b6da6219b3b137f8590164f297c550556
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 10792 bytes
SHA-256: 02ca6cafd9c365edc629086a120e6ec8320a634ad7f1c9e12895283467d88b40
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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